Plants are a class of non-experience-bearing monster that litters certain levels like the Ick Swamp. Worshipping The Earthmother can lead to these being spawned.

Nearly all plants have 1 HP, 0 damage, First Strike, Bloodless (doesn't leave a blood pool) and No Experience (for killing them). Basic plants can be removed without worry (unless you have poisoned an enemy or have a similar ends-on-attack ability). Others have certain effects that may be deleterious to your passage: